• 한국가금학회:학술대회논문집
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• 한국가금학회 2003년도 제20차 정기총회 및 학술발표회
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• pp.99-100
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• 2003

육성기 제한급이가 산란생산성과 사료효율, 계란품질 및 호르몬 농도변화에 미치는 영향을 규명하고자 1일령 갈색 산란계 1,080수를 공시하여 70주령까지 사양시험을 실시하였다. 제한시기는 6주령부터 (T1)와 12주령부터(T2) 실시하였는데 18주령 이후 자유채식을 실시하였다. 산란생산성과 사료효율은 T1이 가장 개선되는 것으로 나타났으며 계란품질은 처리간 차이가 없었다. 호르몬 농도변화는 체중 및 산란 개시시기와 밀접한 관계가 있었으며, 산란시기에 따른 차이는 없었다.

• 한국가금학회지
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• 제22권3호
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• pp.161-166
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• 1995

To evaluate the nutritional values of Spirulina platensis as the protein supplement for laying heo diet, two experimental diets (Control, Spirulina platensis 2%) were prepared. Total 120, 40-wk old ISA Brown layer hens were randomly employed with 15 hens per replicate and 4 replicates per treatment. Hen-day egg production, egg weight, feed intake, intake /egg weight, egg shell thickness, yolk color score and yolk cholesterol content were examined during 6 weeks of experimental period. Hen-day egg production and feed conversion ratio (intake /egg weight) were significantly (P<0.01) improved by the 2% Spirulina plalensis supplementation. However, there were no differences in egg weight and feed intake between hens fed two experimental diets. Egg from hens fed Spirulina platensis 2% diet have more yellowish yolk color than the control egg although there was no difference in egg shell thickness. Yolk cholesterol content was significantly (P

• Asian-Australasian Journal of Animal Sciences
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• 제20권6호
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• pp.944-947
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• 2007

This study was conducted to study the effects of dietary garlic powder on laying performance, egg traits and blood serum cholesterol level of quails. A total of three hundred quails (Coturnix coturnix japonica) aged nine weeks were used. They were allocated to 3 dietary treatments. Each treatment comprised 5 replicates of 20 quails. The diets were supplemented with 0, 5 and 10 g/kg garlic powder. The experimental period lasted 21 weeks. The addition of garlic powder did not significantly affect body weight, egg production, feed consumption, feed efficiency, egg shell thickness, egg albumen index, egg yolk index and egg Haugh unit. Adding 5 and 10 g/kg garlic powder to the laying quail diets increased egg weight (p<0.01). Egg yolk cholesterol and blood serum cholesterol concentration were reduced with garlic powder supplementation. The results of this study demonstrated that garlic powder addition had a significant cholesterol-reducing effect in serum and egg yolk without adverse effects on performance and egg traits of laying quails.

• 농업과학연구
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• 제46권4호
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• pp.991-997
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• 2019

This study was conducted to investigate the laying period performance of two crossbred Korean native chicken (KNC) grand parent stock (GPS) layer during 20 to 40 weeks. A total of 351 20-week-old KNC GPS were allocated in a completely randomized design to give 4 birds per each cage. The chickens were fed commercial diets [i.e., week 20 - 32, crude protein (CP) 18.0% and metabolizable energy (ME) 2,850 kcal/kg; week 32 - 40, CP 17.0% and ME 2,800 kcal/kg)] and fresh water during the whole experiment period ad libitum basis. Body weight, age of sexual maturity, egg weight, hen-day egg production (HDP) and feed conversion ratio (FCR) were measured during the experiment period (week 20 - 40). The results show no significant difference in the Body weight, age of sexual maturity, egg weight, and hen-day egg production (HDP) except for egg weight. 1B had a higher egg weight on week 36 only. We expect that the reason why most factors showed no significant difference is the lack of nutrients caused by limited feeding which follows the standard feeding system for the grand-parent stock. These results provide basic information for laying data in 2-way crossbred Korean native chickens.

• Asian-Australasian Journal of Animal Sciences
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• 제5권2호
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• pp.341-347
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• 1992

Eggs used in this study were obtained from Saudi Arabian Baladi laying hens which were divided into four experimental groups and subjected to the following treatments: Commercial laying ration (17% CP, 3.6% Ca and 0.343%, available P) fed ad libitum as a control (C); Conventional force molting, feed removal for 10 days followed by 18 days full-feed of cracked corn (F); 15 days ad libitum intake of the control ration supplemented, to initiate forced-molt, with 0.35% aluminum as the sulfate (ALS) or the chloride (ALC). The hens were in production for 52 weeks and 17 months of age at the start of the trial and the post-treatment period lasted 36 weeks. During the treatment period F and AL treated groups had similar egg and shell weight, egg surface area, shell thickness and shell weight per unit of surface area but significantly (p<0.05) lower than the control. F had significantly (p<0.05) the highest and the control the lowest Haugh unit values whereas AL fed groups had significantly (p<0.05) lower meat spot incidence compared with the control which tended to have higher value than F group. ALC and F had significantly (p<0.05) the lowest yolk color grade whereas ALC had significantly (p<0.05) lower egg index than ALS and the control. During the post-treatment period the control had significantly (p<0.05) the highest egg index and blood spots incidence and ALS the lowest shell diensity compared with other groups. ALS had significantly (p<0.05) lower shell weight than ALC and the control whereas F and AL treated hens had significantly (p<0.05) the highest Haugh unit values and yolk color grades respectively. F had significantly (p<0.05) lower meat spots incidence than ALC and the control. The same results were observed for ALS compared with the control.

• 한국가금학회지
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• 제31권4호
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• pp.237-244
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• 2004

본 연구는 산란계에 Animunin Powder$^{(R)}$를 첨가 급여시 계란 품질, 혈액 성상 및 영양소 소화율에 미치는 영향을 알아보고자 실시하였다. 이를 위해 22주령 Hy-line Brown 270수를 공시하였고 사양시험은 10일간의 적응기간 후, 5주간 실시하였다. 시험처리구는 Animunin Powder$^{?}$의 첨가수준에 따라 1) Control(CON), 2) Control + $0.1\%$ Animunin Powder$^{(R)}$ (AM1), 3) Control + $0.2\%$ Animunin Powder$^{(R)}$ (AM2)로 3개 처리를 하여 처리당 15반복 반복당 6수씩 임의배치하였다. 산란률은 4주 동안의 기간에서 AM1 처리구가 대조구보다 통계적으로 유의하게 높은 산란률을 보였으며(P<0.05), 8주 동안의 기간에서도 AM1 처리구가 대조구보다 유의적으로 높은 산란률을 보였다(P<0.05). 난중에 있어서는 시험 기간동안 유의적인 차이를 발견할 수 없었다. 난황색은 8주에서 AM2 처리구가 대조구 및 AM1 처리구에 비해 유의하게 높았다(P<0.05). Haugh unit은 4주에서 AM 처리구가 대조구에 비해 유의하게 높은 수치를 보였다(P<0.05). 난각 강도는 처리구간 유의적인 차이를 발견하지 못하였으나, 8주에서 AM2 처리구가 대조구 및 AM1 처리구에 비해 높은 경향을 나타내었다. 난각 두께는 전 기간에 걸쳐 유의적인 차이를 보이지 않았다. 혈청내 콜레스테롤에서는 Animunin Powder$^{(R)}$ 첨가한 시험구에서 콜레스테롤 함량이 유의적으로 낮았다(P<0.05). RBC 및 WBC에서는 허브의 첨가 수준에 따라서 혈액내 RBC및 WBC의 함량이 증가하는 경향을 보였으나 유의적인 차이는 없었다. Lymphocyte는 개시시와 종료시의 변화에서 AM1 처리구가 대조구와 AM2 처리구에 비해 유의적으로 높았다(P<0.05). 4주 및 8주에서 AM1 처리구가 건물의 소화율에서 대조구 및 AM1 처리구에 비해 높은 결과를 나타내었지만 통계적으로 유의적인 차이를 발견하지 못하였다. 결론적으로 산란계에 Animunin Powder$^{(R)}$를 급여 시 생산성 향상에 도움을 주리라 사료된다.

• Asian-Australasian Journal of Animal Sciences
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• 제17권5호
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• pp.684-687
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• 2004

A study was conducted to determine the effect of live weight of pheasants on egg production and egg quality characteristics. A total of 48 ring-necked pheasants were divided into control, heavy, middle and light BW groups. Live weights of the control were 1,187 g, 1,352.92 g for heavy group, 1,247.92 g for middle group and 1,003.33 g for light group. Egg production of groups were found as 47.32, 42.82, 45.79 and 46.51% respectively, in 10 weeks of period. There were no statistical differences on egg production among the groups. The effect of live weight on egg weight, shape index, specific gravity, shell weight, shell thickness, Haugh Unit, yolk weight and albumen weight were found statistically significant (p<0.05). The effect of live weight on albumen index, membrane weight and membrane thickness were found not important (p>0.05). On the other hand, other important factors to be effective on the egg quality of pheasants should be investigated. As a result of this study, live weight of pheasant hens is not an important factor to obtain high egg production in pheasants. But, body conformation of breeding materials should be in good conditions.

• 한국동물번식학회:학술대회논문집
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• 한국동물번식학회 2003년도 학술발표대회 발표논문초록집
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• pp.20-20
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• 2003

Phenotypic characteristics and genetic markers in livestock have been utilized for improvement of the economic traits including egg productivity. Korean Native Ogol Chicken (KNOC) has low egg productivity compared to White Leghorn. Therefore, in this study, serum IGF-I concentration and number of egg production were used as selection markers to improve egg productivity. KNOCs were divided into three groups showing high IGF-I concentration (IGF-I high), high egg production (EP high), and IGF-I/EP high groups. Blood was collected every 10 weeks, and serum concentrations of IGF-I, estradiol (E2), and progesterone (P4) were measured by radioimmunoassay. In comparison of three groups in each generation, the highest increment of egg production was detected in the IGF-I/EP high group from 20 weeks till 40 weeks, and the IGF-I high group also showed the significant increment of egg production after 50 weeks. Interestingly, there were the increase of egg production and decrease of periods in sexual maturity in the second and third generation selected by serum IGF-I concentration, while egg weight and body weight decreased during experimental period. In conclusion, the present study suggest the possibility of IGF-I as a selection marker to improve the egg productivity of KNOC.

• 대한수의학회지
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• 제33권2호
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• pp.277-283
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• 1993

In the present study, observations were made on the life-history of Lymnaea viridis under laboratory conditions, involving incubation period of the eggs and their hatching rate, shell length of the newly hatched snails, sexual maturity, size of the snails when the snail produced the first egg-mass, the number of eggs in each egg-mass, egg-laying, ovipostion, growth rate of the snails, and longevity of the snail. At temperatures between $19.8^{\circ}C$ to $22.5^{\circ}C$, incubation period of the eggs occupied 10~12 days, and after beginning of hatching, all young snails emerged completely from the egg-mass within 5 days. The hatching rate was 88%. The average shell length of the newly hatched snails was about 0.064cm. The rate of growth was extraordinarily rapid under good laboratory conditions. When two snails were reared in one culture vessel($20{\times}15{\times}5cm$) with blue-green algae at about $22^{\circ}C$, snail growth was optimal, taking 37 days to reach 1.2cm in shell length. Sexual maturity reached in about 19 days. The size of the snails at sexual maturity was $0.78{\pm}0.05cm$ in length and $0.47{\pm}0.04cm$ in width. The first egg-masses produced were $0.59{\pm}0.22cm$ in length and $0.34{\pm}0.08cm$ in width, and contained 7~38 eggs. The eggs are usually laid in water. The egg-laying was affected by food and temperature. Snails fed with blue-green algae at about $22^{\circ}C$ produced larger egg-masses than the snails fed with fish food at about $26^{\circ}C$. Under conditions of continuous activity and growth, the maximum expectation of life appears to be 109~350(mean 230) days. And the shell length of snails at death were 1.39~1.64cm.

• Asian-Australasian Journal of Animal Sciences
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• 제12권3호
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• pp.376-380
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• 1999

The purpose of this experiment was to study the effect of feeding winged bean (Psophocarpus tetragonolobus) oil on egg cholesterol and fatty acid of Japanese quail. Four groups of 10-week-old Japanese quails (n=10 per group) were fed a basal diet (20% CP, 2890 kcal/kg) supplemented with 5% of either animal tallow, soybean oil, corn oil or winged bean oil over an 8-week period. At the end of the experiment, 7 birds in each treatment were killed by decapitation. Blood samples and livers were collected for cholesterol analyses. There were no significant differences in final body weight, feed intake, egg production, egg and yolk weight due to the different oil treatments. Egg and plasma cholesterol levels obtained with the winged bean oil diet were higher than those obtained with the animal tallow or soybean oil diets, but were not significantly different from those obtained with com oil diet. Egg lipid, liver lipid and liver cholesterol content was lower with the winged bean oil diet than with the animal tallow diet. It may be concluded that the winged bean oil diet did not impair laying performance, but increased egg and plasma cholesterol levels compared with soybean oil or animal tallow diets. Winged bean oil diet produced eggs with a higher oleic content and lower linoleic content compared with the soybean or com oil diet.